Question

谁来帮我解释一下这道英语选择题

Answer 1

答：时间和
条件状语从句
中用现在时态表示将来，人称“
主将从现
”。
例：I
will
tell
him
about
it
if(/when)
I
see
him
tomorrow.
本题
Many
people
have
realized
that
是主句，为
现在完成时
，不影响that-
宾语从句
的
谓语动词
。可忽略不看。只看下一句就行：
We
won't
have
any
more
clean
water
to
drink
unless
something
_____
to
fight
against
pollution
.
unless=if...
not...是引导条件状语从句的。
B是
将来时
，A是过去时，C是非谓语，可排除。
D。是
一般现在时
的
被动语态
。
unless
sth.
is
done
to
fight
against
pollotion=
If
sth.
is
not
done
to
...
=if
we
don't
do
sth.
to
fight....
译：许多人已经意识到，如果不采取措施与污染作斗争，我们将不再有干净的饮用水可喝。

Answer 2

if/unless的条件句，when等词引导的时间从句中
适用“主将从现”的原则。
本题主干
have
realized表明总时态是现在。
realize的宾语从句中，主句是will
not
（won't）是将来，unless从句中用现在表示将来。
所以只能是D项正确。
本题主要结构
（一级：主句Many
people
have
realized
（二级：宾语从句that
（三级：主句we
won't
have
any
more
clean
water
to
drink
（四级：条件状语从句unless
something
_____
to
fight
against
pollution.））））

Answer 3

home是副词，不能用on
my
way
to,要省略掉to，故不能选a;

in
the
way
of
关于......方面，与句意不符：我将在回家的路上寄这张卡片。

by
the
way是顺便说一下，顺便问一下的意思。

因此，必须选c.

Answer 4

Many
people
have
realized
that
we
won't
have
any
more
clean
water
to
drink
unless
something
_____
to
fight
against
pollution.
A.was
done
B.will
be
done
C.to
be
done
D.is
done
答案是D
因为we
won't
have
any
more
clean
water
to
drink
是将来时态，从句unless
用一般现在时is
done表将来。